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. 2015 Aug 18;6:7987. doi: 10.1038/ncomms8987

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The location of the new PTK site (from which the OH 86 proximal phalanx was excavated) compared with two other major and penecontemporaneous Middle Bed I (Olduvai Formation) sites of FLK 22 Zinjanthropus and FLK NN that also occur near the junction of the Main and Side Gorges. (a) Informal views of excavations at each site. (b) Relationship of the sites in aerial view; lower middle image=a panoramic view of the Gorge looking north, with PTK indicated. (c) Political map of Africa with Tanzania highlighted in black and the approximate location of Olduvai Gorge represented by white dot and a schematic plan view of sites near the junction of the Main and Side Gorges.